<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form method="post" action="/login">
    用户名: <input name="username"><br>
    密码: <input name="password"><br>
    <input type="submit">

</form>

</body>
</html>